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x in (-oo:+oo)
x/3 = 7-(2*x) // - 7-(2*x)
x/3+2*x-7 = 0
7/3*x-7 = 0 // + 7
7/3*x = 7 // : 7/3
x = 7/7/3
x = 3
x = 3
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